pub mod mymath{
    pub fn add(a:i32,b:i32)->i32{
        a+b
    }
   pub fn sub(a:i32,b:i32)->i32{
        a-b
    }
}

fn main() {
    let a=2;
    let b =3;

    println!("{}",mymath::add(a,b));
    println!("{}",mymath::sub(a,b));
}
